40 Brief Notices. 



The author gives a concise account of the succession of the strata, 

 and of the disturbances and erosion whereby the present structure and 

 physical features have been built up and sculptured, attention being 

 drawn to the interesting glacial phenomena, the caves, swallow-holes, 

 and underground water- channels in the Carboniferous Limestone. 



YII. — Brief Notices. 



1. Maryland Geological Survey. — The eighth volume of general 

 reports issued (1909) under the superintendence of Dr. "W. Bullock 

 Clark, State Geologist, like the former volumes, is admirably printed 

 and illustrated. The subjects of road materials and road-construction 

 are further dealt with, and views are given of roads before and after 

 improvement under State aid. There is a detailed report on the 

 mineral industries, accompanied by a useful table of the geological 

 formations of the State and their economic products ; there is also 

 a special report on the limestones with reference to their use in the 

 manufacture of lime and cement. 



2. Natural Resources of Maryland. — The first Report of the 

 Conservation Commission of Maryland for 1908-9 is of much interest 

 and importance. The object of the Commission is the conservation 

 of the natural resources of the country, and among matters to which 

 attention is drawn are the reclamation of great areas of swamp ; 

 the acquisition on the part of the State of the deforested areas 

 around the head-waters of streams that afford the chief water- 

 supplies ; the preservation of special areas of picturesque scenery ; and 

 the prevention of waste in the development of the mineral resources. 

 Professor H. Conwentz (as noted in the Geological Magazine for 

 September, 1909, p. 429) has urged the desirability of taking more 

 care of natural objects of interest, and our Coal Commissions have 

 warned us not to be negligent of our limited supplies of coal. 

 Maryland now supplies an example of organized effort to deal 

 generally and practically with natural phenomena and resources. 



3. Geology of the Country around Sheffield. — A very useful 

 sketch of the geology, by Messrs. B. Hobson, Cosmo Johns, and 

 C. Bradshaw, was issued in the Handbook and Guide for the British 

 Association at the recent Sheffield meeting. Special attention is 

 given to the fossils of the Carboniferous rocks and the Pleistocene 

 mammalia, and there is a good colour-printed geological map. 



4. Cornish Paleozoic Fossils. — Mr. J". H. Collins has prepared 

 Addenda to the working list of Cornish fossils (Trans. Boy. Geol. Soc. 

 Cornwall, xiii, pp. 385-427, 1910), his previous list having been 

 drawn up eighteen years ago. 



5. Rhodesia Museum, Bulawayo. — The eighth annual report of the 

 Museum for 1909 contains an account of the gold-bearing rocks and 

 a list of the minerals of the country, drawn up by Mr. A. E. V. Zealley, 

 who last year succeeded Mr. P. P. Mennell as Geologist and Curator. 



6. Mineral Production of India. — Yol. xxxix of the Records of the 

 Geological Survey of India (1910) contains a Quinquennial Review of 

 the Mineral Production during the years 1904 to 1908, by Sir Thomas 

 H. Holland and Dr. L. Leigh Fermor. Comparing the average values 



